Unnamed (in Terra Cotta Mountains)

The Unnamed (in Terra Cotta Mountains) is a tungsten, gold, arsenic, and antimony mine located in Alaska.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

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Site Name

Primary: Unnamed (in Terra Cotta Mountains)

Commodity

Primary: Tungsten
Primary: Gold
Primary: Arsenic
Primary: Antimony
Secondary: Cobalt

Location

State: Alaska
District: McGrath

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Years of Production:
Organization:
Significant:

Physiography

Not available

Mineral Deposit Model

Model Name: Polymetallic veins

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Extensive ferricrete gossan.

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Pyrite
Ore: Arsenopyrite
Gangue: Quartz

Comments

Comment (Exploration): Status = Inactive

Comment (Workings): Workings / Exploration = The reporter sampled the site in 1988 during geologic mapping for the Alaska Division of Geological and Geophysical Surveys (Bundtzen, Harris, and Gilbert, 1997). One sample contained 240 ppb gold, 2,200 ppm arsenic, 880 ppm tungsten, 110 ppm cobalt, and 200 ppm antimony.

Comment (Geology): Geologic Description = This unnamed occurrence is a quartz-sulfide vein swarm in altered dacitic tuffs of the Eocene, Terra Cotta Volcanic Field (Bundtzen, Harris, and Gilbert, 1997). Most of the material is in the form of talus and no exposures of the veins were observed. Some sulfide zones have been transformed into extensive gossan. The extent of the mineralized area was not measured. One sample contained 240 ppb gold, 2,200 ppm arsenic, 880 ppm tungsten, 110 ppm cobalt, and 200 ppm antimony (Bundtzen, Harris, and Gilbert, 1997).

Comment (Reference): Primary Reference = Bundtzen, Harris, and Gilbert, 1997

Comment (Deposit): Model Name = Polymetallic vein (Cox and Singer, 1986; model 22c).

References

Reference (Deposit): Bundtzen, T.K., Harris, E.E., and Gilbert, W.G., 1997, Geologic Map of the eastern McGrath quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Report of Investigations 97-14, 34 pages, one sheet, scale 1:125,000.

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